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                            <h1 class="post-title">flutter toast插件 OKToast的介绍</h1>
                        </header>
                        <date class="post-meta meta-date">
                            2019年4月18日
                        </date>
                        
                        <div class="post-meta meta-category">
                            |
                            
                                <a href="http://www.kikt.top/categories/flutter">flutter</a>
                            
                        </div>
                        
                        
                        <div class="post-meta">
                            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span> 阅读</span></span>
                        </div>
                        
                        <div class="post-content">
                            <p>OKToast 是一款 在 flutter 上 使用的 toast 插件</p>
<p>使用简单, 可定制性强, 纯 flutter, 调用不用 context</p>
<ul>
<li><a href="#%e5%ae%89%e8%a3%85">安装</a></li>
<li><a href="#%e4%bd%bf%e7%94%a8">使用</a>
<ul>
<li><a href="#%e5%9c%a8%e4%bb%a3%e7%a0%81%e4%b8%ad%e5%ae%9a%e4%b9%89-oktoast-%e7%bb%84%e4%bb%b6">在代码中定义 OKToast 组件</a></li>
<li><a href="#%e8%b0%83%e7%94%a8">调用</a>
<ul>
<li><a href="#%e6%96%87%e6%9c%ac-toast">文本 toast</a></li>
<li><a href="#%e8%87%aa%e5%ae%9a%e4%b9%89-widget">自定义 widget</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#%e7%ae%80%e5%8d%95%e7%9a%84-toast-%e5%ae%9e%e7%8e%b0">简单的 toast 实现</a></li>
<li><a href="#%e8%bf%9b%e9%98%b6%e4%bd%bf%e7%94%a8">进阶使用</a>
<ul>
<li><a href="#%e9%9a%90%e8%97%8f%e5%b7%b2%e5%87%ba%e7%8e%b0%e7%9a%84-toast">隐藏已出现的 toast</a>
<ul>
<li><a href="#%e9%9a%90%e8%97%8f%e6%89%80%e6%9c%89%e7%9a%84-toast">隐藏所有的 toast</a></li>
<li><a href="#%e9%9a%90%e8%97%8f%e5%8d%95%e7%8b%ac%e7%9a%84-toast">隐藏单独的 toast</a></li>
<li><a href="#%e8%87%aa%e5%ae%9a%e4%b9%89%e5%b1%9e%e6%80%a7">自定义属性</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#%e6%9c%ac%e6%96%87%e5%ae%8c%e6%95%b4%e7%9a%84-maindart">本文完整的 main.dart</a></li>
<li><a href="#%e5%92%8c-fluttertoast-%e7%9a%84%e5%af%b9%e6%af%94">和 fluttertoast 的对比</a></li>
<li><a href="#%e5%90%8e%e8%ae%b0">后记</a></li>
</ul>
<h2 id="安装">安装</h2>
<p>查看文档: <a href="https://pub.dartlang.org/packages/oktoast#-installing-tab-">https://pub.dartlang.org/packages/oktoast#-installing-tab-</a></p>
<p>在 pubspec 引入</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#66d9ef">dependencies</span>:
  <span style="color:#66d9ef">oktoast</span>: ^<span style="color:#ae81ff">2.2.0</span> <span style="color:#75715e"># 这一步请查询pub的最新版本</span>
</code></pre></div><p>获取包:
<code>$ flutter packages get</code></p>
<p>引入:
<code>import 'package:oktoast/oktoast.dart';</code></p>
<h2 id="使用">使用</h2>
<h3 id="在代码中定义-oktoast-组件">在代码中定义 OKToast 组件</h3>
<p>包裹你的 MaterialApp,不是包裹你的 Scaffold<br>
包裹你的 MaterialApp,不是包裹你的 Scaffold<br>
包裹你的 MaterialApp,不是包裹你的 Scaffold</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> OKToast( <span style="color:#75715e">// 这一步
</span><span style="color:#75715e"></span>      child: <span style="color:#66d9ef">new</span> MaterialApp(
        title: <span style="color:#e6db74">&#39;Flutter Demo&#39;</span>,
        theme: <span style="color:#66d9ef">new</span> ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: <span style="color:#66d9ef">new</span> MyHomePage(),
      ),
    );
  }
}
</code></pre></div><p>这一步解释一下,因为一般情况下,一个 flutter 应用应该只有一个 MaterialApp(或是 WidgetsApp/CupertinoApp), 这里包裹后,可以缓存 Context 到 内存中,后续在调用显示时,不用传入 BuildContext</p>
<p>这样能满足一部分用户在无 context 的情况下调用 <code>showToast</code> 方法</p>
<h3 id="调用">调用</h3>
<h4 id="文本-toast">文本 toast</h4>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">showToast(<span style="color:#e6db74">&#34;hello world&#34;</span>);  <span style="color:#75715e">// 可选属性看自己需求
</span></code></pre></div><p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190418104706.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190418104706.png"></p>
<h4 id="自定义-widget">自定义 widget</h4>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Widget widget <span style="color:#f92672">=</span> Center(
  child:Container(
      color:Colors.white,
      child:Icon(Icons.add),
  ),
);
showToastWidget(widget);
</code></pre></div><p>使用如下代码的效果</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">
  <span style="color:#66d9ef">void</span> _showCustomWidgetToast() {
    <span style="color:#66d9ef">var</span> w <span style="color:#f92672">=</span> Center(
      child: Container(
        padding: <span style="color:#66d9ef">const</span> EdgeInsets.all(<span style="color:#ae81ff">5</span>),
        color: Colors.black.withOpacity(<span style="color:#ae81ff">0.7</span>),
        child: Row(
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            Icon(
              Icons.add,
              color: Colors.white,
            ),
            Text(
              <span style="color:#e6db74">&#39;添加成功&#39;</span>,
              style: TextStyle(color: Colors.white),
            ),
          ],
          mainAxisSize: MainAxisSize.min,
        ),
      ),
    );
    showToastWidget(w);
  }
</code></pre></div><p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190418104819.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190418104819.png"></p>
<h2 id="简单的-toast-实现">简单的 toast 实现</h2>
<p>其实简单的方案,直接使用 Overlay 就可以了,不需要插件只需要一个简单的工具类,而且代码量并不大</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ToastHelper</span> {
  <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> showToast(BuildContext context, <span style="color:#66d9ef">String</span> text) {
    <span style="color:#66d9ef">const</span> style <span style="color:#f92672">=</span> TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">14.0</span>);

    Widget widget <span style="color:#f92672">=</span> Center(
      child: Container(
        color: Colors.black.withOpacity(<span style="color:#ae81ff">0.5</span>),
        padding: <span style="color:#66d9ef">const</span> EdgeInsets.symmetric(vertical: <span style="color:#ae81ff">5.0</span>, horizontal: <span style="color:#ae81ff">10.0</span>),
        child: Text(
          text,
          style: style,
        ),
      ),
    );
    <span style="color:#66d9ef">var</span> entry <span style="color:#f92672">=</span> OverlayEntry(
      builder: (_) <span style="color:#f92672">=&gt;</span> widget,
    );

    Overlay.of(context).insert(entry);

    Timer(<span style="color:#66d9ef">const</span> Duration(seconds: <span style="color:#ae81ff">2</span>), () {
      entry<span style="color:#f92672">?</span>.remove();
    });
  }
}

</code></pre></div><p>那么为什么要用 OKToast 呢?</p>
<ol>
<li>不用 context,方便一些在网络层的提示</li>
<li>比较方便的自定义,支持自建 widget</li>
<li>有一些小特性,比如软键盘弹出时自动移动位置防遮挡</li>
<li>支持手动隐藏 toast</li>
</ol>
<h2 id="进阶使用">进阶使用</h2>
<h3 id="隐藏已出现的-toast">隐藏已出现的 toast</h3>
<p>有如下的方式可以隐藏</p>
<h4 id="隐藏所有的-toast">隐藏所有的 toast</h4>
<p>手动隐藏:调用这个方法就可以关闭所有的 toast 了</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">dismissAllToast();
</code></pre></div><p>在显示 toast 时隐藏之前显示的所有 toast,其实是根据这个参数在方法内调用<code>dismissAllToast</code></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">showToast(<span style="color:#e6db74">&#34;msg&#34;</span>, dismissOtherToast: <span style="color:#66d9ef">true</span>);
</code></pre></div><p>全局设置隐藏之前的属性,这里设置后,每次当你显示新的 toast 时,旧的就会被关闭</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">OKToast(
  dismissOtherOnShow: <span style="color:#66d9ef">true</span>,
  ...
)
</code></pre></div><h4 id="隐藏单独的-toast">隐藏单独的 toast</h4>
<p>每一个 showToast/showToastWidget 方法会有一个返回值,类型是 ToastFuture</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> future <span style="color:#f92672">=</span> showToast(<span style="color:#e6db74">&#34;msg&#34;</span>);
future.dismiss(); <span style="color:#75715e">// 隐藏指定的toast
</span></code></pre></div><h4 id="自定义属性">自定义属性</h4>
<p>OKToast 组件有丰富的自定义属性</p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190418102102.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190418102102.png"></p>
<p>backgroundColor: 背景颜色</p>
<p>duration: 延迟隐藏时间</p>
<p>onDismiss: 隐藏时的回调</p>
<p>position: toast 的位置</p>
<p>radius: 圆角的尺寸</p>
<p>textAlign: 文字在内部的对齐方式</p>
<p>textDirection: ltr 或 rtl</p>
<p>textPadding: 文本距离边框的 padding</p>
<p>textStyle: 文本的样式</p>
<h2 id="本文完整的-maindart">本文完整的 main.dart</h2>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:async&#39;</span>;

<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:oktoast/oktoast.dart&#39;</span>;

<span style="color:#66d9ef">void</span> main() <span style="color:#f92672">=&gt;</span> runApp(<span style="color:#66d9ef">new</span> MyApp());

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#75715e">// This widget is the root of your application.
</span><span style="color:#75715e"></span>  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> OKToast(
      dismissOtherOnShow: <span style="color:#66d9ef">true</span>,
      child: <span style="color:#66d9ef">new</span> MaterialApp(
        title: <span style="color:#e6db74">&#39;Flutter Demo&#39;</span>,
        theme: <span style="color:#66d9ef">new</span> ThemeData(
          <span style="color:#75715e">// This is the theme of your application.
</span><span style="color:#75715e"></span>          <span style="color:#75715e">//
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// Try running your application with &#34;flutter run&#34;. You&#39;ll see the
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// application has a blue toolbar. Then, without quitting the app, try
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// changing the primarySwatch below to Colors.green and then invoke
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// &#34;hot reload&#34; (press &#34;r&#34; in the console where you ran &#34;flutter run&#34;,
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// or press Run &gt; Flutter Hot Reload in IntelliJ). Notice that the
</span><span style="color:#75715e"></span>          <span style="color:#75715e">// counter didn&#39;t reset back to zero; the application is not restarted.
</span><span style="color:#75715e"></span>          primarySwatch: Colors.blue,
        ),
        home: <span style="color:#66d9ef">new</span> MyHomePage(title: <span style="color:#e6db74">&#39;Flutter Demo Home Page&#39;</span>),
      ),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyHomePage</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  MyHomePage({Key key, <span style="color:#66d9ef">this</span>.title}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#75715e">// This widget is the home page of your application. It is stateful, meaning
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// that it has a State object (defined below) that contains fields that affect
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// how it looks.
</span><span style="color:#75715e"></span>
  <span style="color:#75715e">// This class is the configuration for the state. It holds the values (in this
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// case the title) provided by the parent (in this case the App widget) and
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// used by the build method of the State. Fields in a Widget subclass are
</span><span style="color:#75715e"></span>  <span style="color:#75715e">// always marked &#34;final&#34;.
</span><span style="color:#75715e"></span>
  <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> title;

  <span style="color:#960050;background-color:#1e0010">@</span>override
  _MyHomePageState createState() <span style="color:#f92672">=&gt;</span> <span style="color:#66d9ef">new</span> _MyHomePageState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_MyHomePageState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>MyHomePage<span style="color:#f92672">&gt;</span> {
  <span style="color:#66d9ef">int</span> _counter <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>;

  <span style="color:#66d9ef">void</span> _showToast() {
    showToast(<span style="color:#e6db74">&#34;msg&#34;</span>);
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Scaffold(
      appBar: AppBar(
        title: Text(<span style="color:#e6db74">&#34;OKToast示例&#34;</span>),
      ),
      body: ListView(
        children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
          RaisedButton(
            child: Text(<span style="color:#e6db74">&#39;文字toast&#39;</span>),
            onPressed: _showToast,
          ),
          RaisedButton(
            child: Text(<span style="color:#e6db74">&#39;自定义Widget Toast&#39;</span>),
            onPressed: _showCustomWidgetToast,
          ),
          RaisedButton(
            child: Text(<span style="color:#e6db74">&#39;ToastHelper &#39;</span>),
            onPressed: () <span style="color:#f92672">=&gt;</span> ToastHelper.showToast(context, <span style="color:#e6db74">&#34;toast helper&#34;</span>),
          ),
        ],
      ),
    );
  }

  <span style="color:#66d9ef">void</span> _showCustomWidgetToast() {
    <span style="color:#66d9ef">var</span> w <span style="color:#f92672">=</span> Center(
      child: Container(
        padding: <span style="color:#66d9ef">const</span> EdgeInsets.all(<span style="color:#ae81ff">5</span>),
        color: Colors.black.withOpacity(<span style="color:#ae81ff">0.7</span>),
        child: Row(
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            Icon(
              Icons.add,
              color: Colors.white,
            ),
            Text(
              <span style="color:#e6db74">&#39;添加成功&#39;</span>,
              style: TextStyle(color: Colors.white),
            ),
          ],
          mainAxisSize: MainAxisSize.min,
        ),
      ),
    );
    showToastWidget(w);
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ToastHelper</span> {
  <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">void</span> showToast(BuildContext context, <span style="color:#66d9ef">String</span> text) {
    <span style="color:#66d9ef">const</span> style <span style="color:#f92672">=</span> TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">14.0</span>);

    Widget widget <span style="color:#f92672">=</span> Center(
      child: Material(
        child: Container(
          color: Colors.black.withOpacity(<span style="color:#ae81ff">0.5</span>),
          padding: <span style="color:#66d9ef">const</span> EdgeInsets.symmetric(vertical: <span style="color:#ae81ff">5.0</span>, horizontal: <span style="color:#ae81ff">10.0</span>),
          child: Text(
            text,
            style: style,
          ),
        ),
      ),
    );
    <span style="color:#66d9ef">var</span> entry <span style="color:#f92672">=</span> OverlayEntry(
      builder: (_) <span style="color:#f92672">=&gt;</span> widget,
    );

    Overlay.of(context).insert(entry);

    Timer(<span style="color:#66d9ef">const</span> Duration(seconds: <span style="color:#ae81ff">2</span>), () {
      entry<span style="color:#f92672">?</span>.remove();
    });
  }
}
</code></pre></div><h2 id="和-fluttertoast-的对比">和 fluttertoast 的对比</h2>
<p>为什么不使用 fluttertoast 呢, 我曾经也给 fluttertoast 提交过 PR</p>
<p>但是这个插件本身是依赖于原生的,android 端不可避免在默认样式上会受到 rom 的影响,并且各种属性会有兼容问题</p>
<p>我信奉的原则是,UI 层级的问题,直接在 flutter 端解决</p>
<h2 id="后记">后记</h2>
<p>代码使用并不复杂, 如果对你有帮助解决了问题, 可以给我赞赏 ,请我喝咖啡(下方二维码)</p>

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        <li><a href="/posts/flutter/dialog/dialog-2/">Flutter dialog (2) - showGeneralDialog的使用</a></li>
        
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